10 SUPPLEMENT TO THE CRAG MOLLUSCA. 



It is a very aberrant form of Columbella. The young state of the Crag shell much 

 resembles Buc. minus, Phil. ; it has then a sharp and plain outer lip and a longer 

 canal (see ' Crag Moll.,' Tab. II, fig. 2, d). A fragment, consisting of the outer lip with its 

 denticulations, and a little of the exterior of the shell on which the striated markings are 

 visible, obtained from the Middle Glacial of Hopton, seems referable to this species. It 

 is given in Dr. Woodward's Norwich Crag list as a Bramerton shell, but I have not seen 

 it myself from there. 



Pyrula reticulata, Lamarck. Crag Moll., vol. i, p. 42, Tab. II, fig. 12. 



Localities. Cor. Crag, Ramsholt. Red Crag, Waldringfield, Walton Naze. 



In the Appendix, p. 311, vol. ii, I stated that I thought the cast of Pyrula figured 

 (Tab. XXXI, fig. 6) was the same as the one previously figured from the Coralline Crag, 

 and the specific name reticulata was in consequence proposed to be altered. I now think 

 they belong to two different species, and I here restore to the Cor. Crag shell the name 

 reticulata originally given to it, and the Sandstone cast, which is of a different age from that 

 of the Crag, may retain the name of acclinis until it can be better determined. This Cor. 

 Crag shell has been referred to P. condita, Brongn., by M. Nyst, and to P. cancellata, 

 Grateloup, by Mr. A. Bell, and to P.subiniermedia, Bronn, by Mr. Jeffreys. Two or three 

 specimens of what appear to be P. reticulata of the Cor. Crag have been obtained from 

 the Red Crag. Mr. Bell gives it from Waldringfield. It is probably derivative in the 

 Red Crag. Homes gives eight synonyms to P. reticulata. 



Cassis Saburon, Bruguiere. Supplement, Tab. VI, fig. 2, a, b. 



Le Sabubon, Adanson. Senegal, p. [12, pi. vii, fig. 8, 1758. 

 Cassidea Saburon, Brug. Ency., p. 420. 



Locality. Red Crag, Waldringfield. 



This has been obtained from the diggers in the Red Crag at Waldringfield by 

 Mr. Canham. It is probably an extraneous fossil, and derived from some anterior 

 formation. The shell has undergone a good deal of water action, and I cannot perceive a 

 trace of striation upon the surface ; still, it so appears to correspond in all other respects 

 with the species to which I have referred it, that I imagine the stria? have been rubbed off, 

 or the outer surface has decorticated away, as it is quite smooth j it is also a little disfigured 

 by the loss of a portion of its canal, but this was probably done in the lifetime of the 

 animal and clumsily repaired. 



This is a living species, with an extensive geographical range, being found on the 

 coast of Spain, Portugal, and Algiers. It is a fossil of the Bordeaux beds and the Vienna 

 basin, and M. Nyst gives it from the « Crag gris " of Belgium, and it may possibly have 

 lived in the Coralline Crag Sea. 



